Abrasive block.



No. 651,479. 'Pa'tnted l une mi, 1900. K. ESSICH & R. REUCHLIN.

ABRASIVE BLOCK.

(A plication filed Apr. 1, 1899.)

(No Model.)

( 1m van rm 8 [Tot HOIJ as co PHOTO-LITHQ, WASHINGYON, n. c.

" NITED STATES PATENT OFFICE.

KARL ESSIOII AND RICHARD REUOI'ILIN, OF STIITTGART, GERMANY.

ABRASIVE BLOCK.

SPECIFICATION forming part of Letters Patent N0. 651,47 9, dated J ne; 12, 1900.

Application filed A ril 1, 1899. Serial No. 711,351. (No model.) I

To all whom it may concern:

Be it known that we, KARnEssIOH and RICHARD REUCHLIN, citizens of the German Empire, residing at Stuttgart, Wiirtemberg, Germany, have invented certain new and useful Improvements in Grinding Stones for Grinding and Polishing Lithographical Stones; and We do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to abrasive blocks. Its object is to provide a form of hollow block having a very extensive working surface, while the actual grinding-surface is comparatively small.

Referring to the accompanying drawings, Figure 1 shows a perspective View of our preferred form of construction. Fig. 2 shows a longitudinal section. verse section.

In the several figures, 9 represents a rectangular tube having longitudinal edges slightly rounded and ends preferably at right angles to the sides, and an intermediate retaining-wall is provided, which preferably extends from side to side transversely of the block. This wall being comparatively thin leaves a large free interior space, the great advantage of which is to allow the separated abraded material to free itself from between Fig. 3 shows a trans the contacting surfaces. When the block is worn too small to be readily grasped by hand, it can then be cemented to a supportingblock, and therefore used until the last fragments are worn away. By this arrangement a very extensive working surface is obtained, while the actual grinding-surface is comparatively small, and therefore a less amount of power is required to accomplish the work than heretofore.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. A grinding-block composed of abrasive material and formed in the shape of a tube of oblong rectangular cross-section, and having an intermediate supporting-wall extending from one side to the other, substantially as set forth.

2. A grinding-block composed of abrasive material and formed in the shape of a tube of oblong rectangular cross section, and having an intermediate supporting-wall parallel to the narrower side walls, substantially as described.

In testimony whereof we affix our sigmatures in presence of two witnesses.

KARL ESSIOH. RICHARD REUOIILIN. Witnesses:

AUGUST DRAUTZ, HERMAN WAGNER. 

